How about creating a new category called Music Notation?
You are right, this is am impressive number of projects related to
standard music notation. I’d nevertheless argue against yet another
category, it is very difficult to draw a dividing line between sclang
programming, score generation and standard music notation output.
Furthermore, categories are yet another additional drag for users using
mailing list mode like me usually, who usually just post to ct-questions@m.scsynth.org all the time anyway as it is hard to remember
which email address is for which category.